Googling for Medievalists

You can significantly increase your recall rate by searching on alternative medieval spellings for your target. For example, instead of

Seneschal Hainault

try:

Seneschal OR senechal OR senescal OR senescall OR senescallum
Hainault OR Hainaut OR Haynau OR Hynnault OR Henaud OR Henaude

I've started building a thesaurus file of alternate spellings of names and words of interest to me. I can paste them into the Google search panel as needed. If you want words that aren't proper names, the Middle English Dictionary is a good resource, and there are middle French dictionaries online as well.